Improvement in hair-spring studs for watches



J. P. AnAMs.

H ai r- Sp ring Studs for W atch es.- N 0. 140,231. P'atented lune 24, 1873.

NITNESES I luvzmm John Y. (Mums .tached view of the hair-spring stud.

UNI ED STATES PATEN OFFICE.

JOHN P. ADAMS- OF IPSWICH, MASSACHUSETTS.

IMPROVEMENT IN HAIR-SPRING s'ruos FQR WATCHES.

' Specification forming part of Letters Patont No. 146,231, dated June 2|, 1873; application filed April 28, 1873.

To all whom it may concern: 7

Be it known that I, JOHN P. ADAMS, of Ipswich, in the county of Essex and State of Massachusetts, have invented a new and Improved Hair'Spring Stud, of which thej'ollowing is a specification:

There has always been more or less difficulty experienced by watchmakers and repairers of watches in manipulating the hair-spring, owing to the difliculty of putting the spring into place without injury;. also, by adjusters of fine watches in constructing a hair-spring the stud is quadrangular, pot triangular. It

stud whichcan be removed asmany times as desired, and always replaced into its exact former position,

I have endeavored, in this invention, to ob- "late this difiiculty, and have produced a hairspring stud which combines the following requisitcs: First, my stud is light, thus preventing injury "to the hair-spring in cleaning;' second, it is easily and cheaply made; third, it can be removed and replaced precisely as orig-, inally intended; fourth, it will enter into its place automatically. This last has been the great desideratum, and is the most important advan tage of my invention.

The nature of my invention is fully described below. y

In the accompanying drawings-,- Figure lis a plan view of the bridge, balance-wheel, hairspring, &c., of a watch, embodying my inven- (ion. Fig. 2 is a side elevation of the same. Fig. 3 is a transverse section. Fig. .4 is a de- Similarletters of reference indicate corre-' sponding parts. a is the bridge. b is the balance-wheel. d is the hair-spring. e is my hair-spring stud.

I regard the shape of my stud as eminently fitted to my purpose, which is mainly to cause the stud to enter into its exact former place automatically after being removed, no adjusting whatever being required. 1 A

It will be noticed that theupperside of presses against the bridgeupon three sides.

I maintain that a stud held by the ordinary screw is more easily restored to its exact former position, both laterally and perpendicu-- larly, than'one held by a set-screw, hence I have placed my stud at the edge of the bridge, and passed a screw through it into the bridge.

My stud may be so made that its upper side may be nearly or quite rectangular, if desired.

Having thus fully described my invention,

I do not claim a cone-shaped or triangulan stud but i What I claim, and desire to secure by Let ters Patent, is-.' I

.The combination and arrangement, with the bridge in awatch-movement of the hair-sprin g stud c, constructed of the shape hereinbefore described, and its upper surface being quadrangular 1n shape, and said stud e being attached to the side of the bridge by a screw, 9,

. passing through the stud into the bridge.

, JOHN P. ADAMS. Witnesses:

HENRY W. WILL-mus, E. H. 03m, 

